what is the accurate and standard method of manpower estimation in construction projects?

 1. Productivity rate as available in CPWD schedule.

2. Technical skills of work force.

3. Site condition 

4. Availability of Material,Plant,machinery & equiptmets.

Almost all Central Government  Departments have their own Schedule of Rates.Apart from that ,all State Governments have updated list of minimum wages/labor rates according to nature of works.Following these schedule of rates may partially help,but not accurately as to satisfy the questionnaire.The best  and accurate methodology is to carry out rate analysis of each activity taking help from these published basic data.This way one may obtain realistic man power estimation.

Standard Schedule of Works published by all state Govt and and central agencies give fairly reasonable estimate of manpower and machinery requirement although it is impossible to estimate accurate time.

Hi Afaque, interesting question.

The manpower estimate consists of a listing of the number of direct labor man-days required to complete the various activities of a specific project. They are Builder (BU), Construction Electrician(CE), Equipment Operator (EO), Steelworker (SW),and Utilitiesman (UT).

Thanks.....

The data for manpower estimation is job specific and region specific.

It also depend on the location of height of the work..Al ways the nature of the manpower estimation changes from Project manager to manager location to location.The location of work may be at restricted area where permits need be taken from time time in petrolium industry:polluted environment; defence establishment where passes to be renewed from time to time. It also depends onthe weather extremely hot or cold or rainy weather.

Every time it is a test to project executive to asses the manpower for the project works.There is no supplimant to the on ground knowledge of the project managers gained on the basis of their vast experience.

Time and motion study is the best way toarrive at the labour constants to assist in manpower estimation.

Yes the constants are very helpful in case of the machinary wherethe environmental influence is less and the estimate of the work hours can be near accurate.

MANPOWER ESTIMATION IS DONE WITH THE HELP OF GUIDELINES GIVEN IN SCHEDULE AND SPECIFICATION DERIVED BY THE BIGGEST ROADWORK INDUSTRY/DEPTT. OF GOVT OF U.P.KNOWN AS PUBLIC WORKS CEPARTMENT, AND IS FOLLOWED BY ALL CONSTRUNCTION AGENCIES/DEPTT.OF STATE,THIS HAS BEEN A OLD METHOD OF ESTIMATION AND FOR EXECUTION OF WORK,BUT NOW WITH THE HELP OF CAD(COMPUTER AIDED DESIGN)

 It is very difficult to mention any standard and accuate method for estimating manpower as the requirement varies from site to site. It depends on the Project Manager, Site conditions, Quality of work.

Every project manger should maintain the trend record of productivity against manpower by weekly or monthly basis, this will be practical method to get accurate manpower requirement.

Man Power  estimation was done on the basis of the norms as per the industry, quality and the type of work. 

These norms has been arrived from past data only.

Like for Tunnelling . we take Driller 0.079 /cum likewise . However the norms can be adjusted as per project.

CPWD and PWD are basedon Historical data , Scientific analysis and regional data . So these are accurate as BENCHMARKS only . However , one has to analyse based on location where project is being executed with the Rate Analysis parameters given by CPWD or PWD .